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The BOS is Donnelly's most aggressive mud tread. Eire Chen's Specialized Crux. Junior Women 11-12. 2018 Cyclocross National Championships, Louisville, KY. © A. Yee / Cyclocross Magazine

The BOS is Donnelly’s most aggressive mud tread. Eire Chen’s Specialized Crux. Junior Women 11-12. 2018 Cyclocross National Championships, Louisville, KY. © A. Yee / Cyclocross Magazine